Wednesday brought the debut of the latest rock stars in Seattle coffee connoisseurship to a parking lot on Capitol Hill — and you’re too late to say you were there.

But you can say you were there for the second day of Slate Coffee Roasters and their mobile “Slatestream” trailer. The Twitter feed promises a 6:30 to 11 AM run Thursday morning in the Piecora’s parking lot at 14th and Madison.

Coffee smart guys Sprudge were impressed with the pedigree:

The project has a few intriguing resumes to boast, with an opening staff that includes Timothy Graham (ex-Victrola), Brandon Paul Weaver, and Nik Virrey (both former Zoka employees).

It’s the second appearance of Virrey — who also tends bar at Liberty — on the site this week, by the way.

Slate, also apparently opening a cafe in Ballard, takes a manifesto approach to its coffee vision:

Central to this vision is the idea that coffee is special – chemically, it is the most complex item humans consume. When handled correctly, coffee can exhibit a diversity of flavors unlike anything else on the planet. Tasting coffees like these represented a paradigm shift in our idea of what coffee could be and it is Slate’s goal to share these coffees with you. To do this, we have tried to reframe the coffee experience in a culinary context by emphasizing intentionality, hospitality and exploration. 

You can learn more at slatecoffee.com. Check out @slatecoffee to keep track of the Slatestream’s comings and goings.